[Test-Equipment] TV-2

[Pete Lancashire]

I submit I have been fooled .. but having a tube that has its
characteristics accuratly known
as a verification I guess is like having a known resistor, cap etc as
a check for a bridge.

-pete





On Thu, Jul 15, 2010 at 11:35 PM, Brian Goldsmith
<brian.goldsmith at echo1.com.au> wrote:
>
>
> -----Original Message-----
> From: Carl
>
> The calibration tube came out of the audiophool world as a way to dig into
> the wallets.
>
>
> Carl
> KM1H
>
>
>
> ******Perhaps there is a problem with the use of the word
> "calibration".Fifty or more years ago the British AVO company advised users
> of their VCM and CT range of Valve Characteristic Meters to create and later
> use a "Standardised Valve" on a regular (weekly) basis.This valve was not
> intended as a "Calibration" device,rather it was a checking device to show
> that the VCM or CT device was still reading near enough to what is was
> reading last week (or the week before etc.) when the "Standardised Valve"
> was created.There was no suggestion that users should use the  bogey valve
> as a calibration tool.Nor would I have thought the current audiophool
> fraternity have gone so far as to recommend anyone to use their sooper
> dooper "calibrated" tube as a standard device that one could use to actually
> calibrate their tube tester.
> Words need to be used carefully in an Engineering context.
>
> Brian G.
>
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